Hoymiles HM-1000N User manual

Version 1.0 (June 2020)

MI-1000T/MI-1200T/MI-1500T

About Microinverter

This system is composed of a group of Microinverters that convert direct current (DC) into alternating

current (AC) and feeds it into the public grid. The system is designed for the incorporation of one

Microinverter for two photovoltaic modules. Each Microinverter works independently that guarantees the

maximum power generation of each photovoltaic module. This setup enables user to control the production

of a single photovoltaic module directly, consequently improving the flexibility and reliability of the system.

About the Manual

This manual contains important instructions for the MI-1000T/MI-1200T/MI-1500T Microinverter and must

be read in its entirety before installing or commissioning the equipment. For safety, only qualified technician,

who has received training or has demonstrated skills can install and maintain this Microinverter under the

guide of this document.

Other Information

Product information is subject to change without notice. User manual will be updated frequently, please

refer to Hoymiles official website at www.hoymiles.com for the latest version.

                                            
©   2019  Hoymiles  Converter  Technology  Co.,  Ltd.  All  rights  reserved.                                            3   
 
MI-1000T/MI-1200T/MI-1500T 
Contents 
Important Notes .................................................................................................................................................. 5 
1 Product Range .............................................................................................................................................. 5 
2 Target Group ................................................................................................................................................. 5 
3 Symbols Used ............................................................................................................................................... 5 
About Safety ........................................................................................................................................................ 5 
1 Important Safety Instructions ...................................................................................................................... 5 
2 Explanation of Symbols ............................................................................................................................... 6 
3 Radio Interference Statement .................................................................................................................... 7 
About Product ..................................................................................................................................................... 7 
1 About 4 in 1 Unit ........................................................................................................................................... 7 
2 Highlights ....................................................................................................................................................... 8 
3 Terminals Introduction ................................................................................................................................. 8 
4 Dimension(mm) ............................................................................................................................................ 8 
About Function .................................................................................................................................................... 9 
1 Work Mode .................................................................................................................................................... 9 
About Installation ................................................................................................................................................ 9 
1 Accessories ................................................................................................................................................... 9 
2 Installation Precaution ............................................................................................................................... 10 
3 Space Distance Required ......................................................................................................................... 10 
4 Preparation .................................................................................................................................................. 10 
5 Pre-installation ............................................................................................................................................ 11 
6 Installation Steps ........................................................................................................................................ 12 
Troubleshooting ................................................................................................................................................ 15 
1 Troubleshooting List .................................................................................................................................. 15 
2 Status LED Indicator .................................................................................................................................. 18 
3 On-site Inspection (For qualified installer only) ..................................................................................... 19 
4 Routine Maintenance ................................................................................................................................. 19 
5 Replace Microinverter ................................................................................................................................ 20 
Decommissions ................................................................................................................................................. 21 
1 Decommissions .......................................................................................................................................... 21 
2 Storage and Transportation ...................................................................................................................... 21 
3 Disposal ....................................................................................................................................................... 22 

MI-1000T/MI-1200T/MI-1500T

8. Technical Data .................................................................................................................................................. 22

8.1 DC Input ....................................................................................................................................................... 23

8.2 AC Output .................................................................................................................................................... 23

8.3 Efficiency, Safety and Protection ............................................................................................................. 23

8.4 Mechanical Data ......................................................................................................................................... 23

8.5 Features ....................................................................................................................................................... 24

Appendix 1: ............................................................................................................................................................ 25

Installation Map ................................................................................................................................................. 25

Appendix 2: ............................................................................................................................................................ 26

WIRING DIAGRAM – 230VAC SINGLE PHASE: ........................................................................................ 26

WIRING DIAGRAM – 230VAC / 400VAC THREE PHASE: ....................................................................... 27

WIRING DIAGRAM –120VAC / 240VAC SPLIT PHASE: .......................................................................... 28

WIRING DIAGRAM – 120VAC / 208VAC THREE PHASE: ....................................................................... 29

MI-1000T/MI-1200T/MI-1500T

1. Important Notes

1.1 Product Range

This manual describes the assembly, installation, commissioning, maintenance and failure search of

the following model of Hoymiles Microinverter:

⚫ MI-1000T

⚫ MI-1200T

⚫ MI-1500T

*Note: “1000” means 1000W, “1200” means 1200W, “1500” means 1500W.

1.2 Target Group

This manual is only for qualified technician, who has been trained or has demonstrated skills can

install and maintain this Microinverter under the guide of this document for safety purpose.

1.3 Symbols Used

The safety symbols in this user manual are show as below.

2. About Safety

2.1 Important Safety Instructions

The MI-1000T/MI-1200T/MI-1500T Microinverter is designed and tested according to international

safety requirements. However, certain safety precautions must be taken when installing and operating

this inverter. The installer must read and follow all instructions, cautions and warnings in this

Symbol

Usage

Indicates a hazardous situation that can result in deadly electric shock

hazards, other serious physical injury, or fire hazards.

Indicates directions which must be fully understood and followed in

entirety in order to avoid potential safety hazards including equipment

damage or personal injury.

Indicates this points out that the described operation must not be carried

out. The reader should stop, use caution and fully understand the

operations explained before proceeding.

MI-1000T/MI-1200T/MI-1500T

installation manual.

➢ All operations including transport, installation, start-up and maintenance, must be carried out by

qualified, trained personnel.

➢ Before installation, check the unit to ensure free of any transport or handling damage, which could

affect insulation integrity or safety clearances. Choose installation location carefully and adhere to

specified cooling requirements. Unauthorized removal of necessary protections, improper use,

incorrect installation and operation may lead to serious safety and shock hazards or equipment

damage.

➢ Before connecting the Microinverter to the power distribution grid, contact the local power

distribution grid company to get appropriate approvals. This connection must be made only by qualified

technical personnel. It is the responsibility of the installer to provide external disconnect switches and

Over current Protection Devices (OCPD).

➢ Only one photo voltaic module can be connected to one input of the inverter. Do not connect

batteries or other sources of power supply. The inverter can be used only if all the technical

characteristics are observed and applied.

➢ Do not install the equipment in adverse environment conditions such as flammable, explosive,

corrosive, extreme high or low temperature, and humid. Do not use the equipment when the safety

devices do not work or disabled.

➢ Use personal protective equipment, including gloves and eye protection during the installation.

➢ Inform the manufacturer about non-standard installation conditions.

➢ Do not use the equipment if any operating anomalies are found. Avoid temporary repairs.

➢ All repairs should be carried out using only qualified spare parts, which must be installed in

accordance with their intended use and by a licensed contractor or authorized Hoymiles service

representative.

➢ Liabilities arising from commercial components are delegated to their respective manufacturers.

➢ Anytime the inverter has been disconnected from the public network, please be extremely caution

as some components can retain charge sufficient to create a shock hazard. Prior to touching any part

of the inverter please ensure surfaces and equipment are under touch safe temperatures and voltage

potentials before proceeding.

➢ Hoymiles accepts No liability for damage from incorrect or improper operation.

➢ Electrical Installation & Maintenance shall be conducted by licensed electrician and shall comply

with Local Wiring Rules.

2.2 Explanation of Symbols

Symbol

Usage

Treatment

To comply with European Directive 2002/96/EC on waste Electrical and

Electronic Equipment and its implementation as national law, electrical

equipment that has reached the end of its life must be collected separately and

returned to an approved recycling facility. Any device no longer required must

be returned to an authorized dealer or approved collection and recycling facility.

MI-1000T/MI-1200T/MI-1500T

Caution

Do not come within 8 inches (20cm) of the microinverter for any length of time

while it is in operation.

Danger of high voltages

Danger to life due to high voltage in the microinverter.

Beware of hot surface

The inverter can become hot during operation. Avoid contact with metal

surfaces during operation.

CE mark

The inverter complies with the requirements of the Low Voltage Directive for the

European Union.

Read manual first

Please read the installation manual first before installation, operation and

maintenance.

2.3 Radio Interference Statement

This microinverter has been tested and found to comply with the limits for CE EMC, which can provide

reasonable protection against harmful energy. However, if not installed according to the instructions,

the microinverter may cause harmful interference to radio equipment. There is no guarantee that the

interference will not occur in a particular installation.

To confirm that the radio or television reception is interfered by this equipment, you can turn the

equipment off and on. If this equipment does cause harmful interference to the radio or television

equipment, please try to correct the interference by one or more of the following measures:

1) Relocate the receiving antenna.

2) Increase the separation between the microinverter and the receiving antenna.

3) Place the shield between the microinverter and the receiving antenna, such as metal /

concrete roof.

4) Contact your dealer or an experienced radio/TV technician for help.

3. About Product

3.1 About 4 in 1 Unit

“The world’s First Daisy-Chain 4 in 1 Unit Microinverter” with extremely wide DC input operating

voltage range (16-60V) and low start-up voltage (22V only).

MI-1000T/MI-1200T/MI-1500T

Hoymiles 4 in 1 unit Microinverter MI-1000T/MI-1200T/MI-1500T is the perfect selection for PV system

with uneven number of panels with world’s NO.1 CEC weighted efficiency – 96.50% (peak efficiency

96.70%) in 2015.

3.2 Highlights

- Maximum output power up to 1000W/1200W/1500W; Adapted to 60 & 72 cells PV panels.

- Peak efficiency 96.70%; CEC weighted efficiency 96.50%.

- Static MPPT efficiency 99.80%; Dynamic MPPT efficiency 99.76% in overcast weather.

- Power factor (adjustable) 0.8 leading……0.8 lagging.

- External antenna for stronger communication with DTU.

- High reliability: NEMA6 (IP67) enclosure; 6000V surge protection.

3.3 Terminals Introduction

3.4 Dimension(mm)

Object

Description

A

AC Connector

B

DC Connector

MI-1000T/MI-1200T/MI-1500T

4. About Function

4.1 Work Mode

Normal: Under this mode, Microinverter is operating normally and convert DC power into AC power to

support the house loads and feed in to Public Grid.

Zero Export Control: Under this mode Microinverter’s generation is limit base on the current house

loads, there will be no extra power feed in to the Public Grid.

Stand by: There are several circumstance that Microinverter will stay in Standby mode:

- The current condition is contradicted with Microinverter operating requirement.

- No house loads or the Export control value has been set as “0” on the DTU under the Zero Export

Control mode.

5. About Installation

5.1 Accessories

Item

Description

A

AC Bus Cable, 12/10 AWG Cable

B

DC Extension Cable, 1m

C

M8*25 screws

D

AC Connector Unlock Tool

E

Bus Connector Unlock Tool

F

AC Sub Cap

G

AC Bus End Cap, IP67

*Note: All accessories above are not included in the package, and need to be purchased separately. Please contact our

sales representative for the price. (M8 screws need to be prepared by installer-self.)

MI-1000T/MI-1200T/MI-1500T

5.2 Installation Precaution

Please install the Microinverter and all DC connections under the PV module to avoiding direct sunlight,

rain exposure, snow layup, UV etc. Allow a minimum of 2 cm of space around the microinverter

enclosure.

*Note: For some countries the DTU will be required to meet the local grid regulation (e.g. G98/99 for UK etc.)

5.3 Space Distance Required

Please install the Microinverter at least 50cm above the ground/roof for better communication with

Hoymiles DTU. Please contact with Hoymiles technical engineer if there is any special circumstance.

5.4 Preparation

Installation of the equipment is carried out based on the system design and the place in which the

equipment is installed.

MI-1000T/MI-1200T/MI-1500T

The installation must be carried out with the equipment disconnected from the grid (power

disconnect switch open) and with the photovoltaic modules shaded or isolated.

Referring to the Technical Data to make sure the environmental conditions fit the

microinverter’s requirement (degree of protection, temperature, humidity, altitude, etc.)

To avoid power de-rating due to an increase in the microinverter internal temperature, do not

expose it to direct sunlight.

To avoid overheating, always make sure the air flow around the inverter is not blocked.

Do not install in places where gasses or flammable substances may be present.

Avoid electromagnetic interference that can compromise the correct operation of electronic

equipment.

When choosing the position of installation, comply with the following conditions:

Install only on structures specifically conceived for photovoltaic modules (supplied by

installation technicians).

Install Microinverter underneath of the photovoltaic modules to make sure it works in

theshadow. If this condition cannot be met, might trigger the inverter production de-rating.

Fig.1 Installation position of microinverter

5.5 Pre-installation

A) Plan the cable length to make the bus cable aligned with each PV module.

B) Install the AC bus end cap:

✓ Use the bus connector unlock tool to unlock the port upper cover;

MI-1000T/MI-1200T/MI-1500T

✓ Loose the three screws with the screwdriver. Untighten the cap as circled below, and remove the

extra cable.

✓ Screw the cap back to port, and plug in the AC bus end cap.

✓ Plug the upper cover back to the bus connector.

5.6 Installation Steps

Step 1. Fix Microinverter on the Rail

A) Mark the approximate center of each panel on the frame.

B) Fix the screw on the rail.

C) Hang the microinverter on the screw (shown as picture below), and tighten the screw.The silver

cover side of the Microinverter should be facing the panel.

*Note: Please install the microinverter at least 50cm above the ground/roof for better communication with Hoymiles

DTU.

Step 2. Complete the AC Connection

A) Attach the AC bus cable with the mounting rail, and fix the cable with tie wraps.

MI-1000T/MI-1200T/MI-1500T

B) Push the AC connector of the microinverter to the trunk cable connector until you hear “click”.

C) If there is any vacant bus port, please plug the AC sub cap on the vacant plug to ensure

waterproof and dustproof.

*Note: Under the circumstances that need to remove the inverter AC cable from bus port, please use the AC connector

unlock tool and insert the tool into the side of AC port.

Step 3. Install AC End Cable

A) Prepare the AC end cable with the proper length, and insert one side of the cable into the cap.

Match the L, N and Ground line into the slot accordingly. Tighten the screws, and then tighten the cap

back to the port. Plug the upper cover back to the bus connector.

B) Connect the other side of the AC end cable to the distribution box, and wire it to the local grid

network.

Step 4. Create an Installation Map

A) Peel the removable serial number lable from each microinverter (The position of the label is

MI-1000T/MI-1200T/MI-1500T

shown as below).

B) Affix the serial number label to the respective location on the installation map.

Step 5. Connect PV Modules

A) Mount the PV modules above the microinverter.

B) Connect the PV modules’ DC cables to the DC input side of the microinverter.

MI-1000T/MI-1200T/MI-1500T

Step 6. Energize the System

A) Turn on the AC breaker of the branch circuit.

B) Turn on the main AC breaker of the house. Your system will start to generate power after about

two-minute wait time.

Step 7. Set Up the Monitoring System

Refer to the DTU User Manual or DTU Quick Install Guide, and Quick Installation Guide for HMP

Online Registration to install the DTU and set up the monitoring system.

Product information is subject to change without notice. (Please download reference manuals at

www.hoymiles.com)

6. Troubleshooting

6.1 Troubleshooting List

Alarm

Code

Alarm Name

Suggestion

121

Over temperature

protection

1. Check the ventilation and ambient temperature at the microinverter

installation position.

2. If the ventilation is poor or the ambient temperature exceeds the limit,

improve the ventilation and heat dissipation.

3. If both the ventilation and ambient temperature meet the requirements,

contact your dealer or Hoymiles technical support.

125

Grid configuration

parameter error

1.Check if the grid configuration parameter is correct and upgrade again.

2. If the fault still exists, contact your dealer or Hoymiles technical

support.

126

Software error code

126

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

127

Firmware error

1.Check if the firmware is correct and upgrade again.

2.Check the communication between DTU and Hoymiles monitoring

system, the communication between DTU and microinverter. Then try

again.

3. If the fault still exists, contact your dealer or Hoymiles technical

support.

128

Software error code

128

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

MI-1000T/MI-1200T/MI-1500T

129

Software error code

129

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

130

Offline

1.Please make sure that the microinverter works normally.

2.Check the communication status between the DTU and hoymiles

monitoring system or between the DTU and the microinverter.If the

communication is poor, try to make some improvements.

3. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

141

Grid overvoltage

1. If the alarm occurs accidentally, the grid voltage may be abnormal

temporarily. The microinverter can recover automatically after grid

voltage becomes normal.

2. If the alarm occurs frequently, check whether the grid voltage is within

the acceptable range. If no, contact the local power operator or change

the grid overvoltage protection limit via Hoymiles monitoring system with

the consent of the local power operator.

142

10 min value grid

overvoltage

1. If the alarm occurs accidentally, the grid voltage may be abnormal

temporarily. The microinverter can recover automatically after grid

voltage becomes normal.

2. If the alarm occurs frequently, check whether the grid voltage is within

the acceptable range. If no, contact the local power operator or change

the grid overvoltage protection limit via Hoymiles monitoring system with

the consent of the local power operator.

143

Grid undervoltage

1. If the alarm occurs accidentally, the grid voltage may be abnormal

temporarily. The microinverter can recover automatically after grid

voltage becomes normal.

2. If the alarm occurs frequently, check whether the grid voltage is within

the acceptable range. If no, contact the local power operator or change

the grid undervoltage protection limit via Hoymiles monitoring system

with the consent of the local power operator.

3. If the fault still exists, check the AC switch or AC wiring.

144

Grid overfrequency

1. If the alarm occurs accidentally, the grid frequency may be abnormal

temporarily. The microinverter can recover automatically after grid

frequency becomes normal.

2. If the alarm occurs frequently, check whether the grid frequency is

within the acceptable range. If no, contact the local power operator or

change the grid overfrequency protection limit via Hoymiles monitoring

system with the consent of the local power operator.

145

Grid underfrequency

1. If the alarm occurs accidentally, the grid frequency may be abnormal

temporarily. The microinverter can recover automatically after grid

frequency becomes normal.

2. If the alarm occurs frequently, check whether the grid frequency is

within the acceptable range. If no, contact the local power operator or

MI-1000T/MI-1200T/MI-1500T

change the grid underfrequency protection limit via Hoymiles monitoring

system with the consent of the local power operator.

146

Rapid grid frequency

change rate

1. If the alarm occurs accidentally, the grid frequency may be abnormal

temporarily. The microinverter can recover automatically after grid

frequency becomes normal.

2. If the alarm occurs frequently, check whether the grid frequency

change rate is within the acceptable range. If no, contact the local power

operator or change the grid frequency change rate limit via Hoymiles

monitoring system with the consent of the local power operator.

147

Power grid outage

Please check whether there is a power grid outage.

148

Grid disconnection

Please check whether the AC switch or AC wiring is normal.

149

Island detected

1. If the alarm occurs accidentally, the grid voltage may be abnormal

temporarily. The microinverter can recover automatically after grid

voltage becomes normal.

2. If the alarms occur frequently on all the microinverters in your station,

contact the local power operator to check whether there is a grid island.

3.If the alarm still exists, contact your dealer or Hoymiles technical

support.

205

Input port

overvoltage

1.Please make sure that the PV module open-circuit voltage is less than

or equal to the maximum input voltage.

2. If the PV module open-circuit voltage is within the normal range,

contact your dealer or Hoymiles technical support.

207

Input port

undervoltage

1.Please make sure that the PV module open-circuit voltage is less than

or equal to the maximum input voltage.

2. If the PV module open-circuit voltage is within the normal range,

contact your dealer or Hoymiles technical support.

209

Port No input

1. Please confirm whether this port is connected to the PV module;

2. If the PV module is connected, please check the DC cable connection

between this port and the PV module.

301

Hardware Error Code

301

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

302

Hardware Error Code

302

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

303

Hardware Error Code

303

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

304

Hardware Error Code

304

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

MI-1000T/MI-1200T/MI-1500T

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

305

Hardware Error Code

305

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

306

Hardware Error Code

306

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

307

Hardware Error Code

307

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

308

Hardware Error Code

308

1. If the alarm occurs accidentally and the microinverter can still work

normally, no special treatment is required.

2. If the alarm occurs frequently and cannot be recovered, contact your

dealer or Hoymiles technical support.

6.2 Status LED Indicator

The LED flashes five times at start up. All green flashes (1s gap) indicate normal start up.

(1) Start-up Process

✓ Flashing green five times (0.3s gap): Start-up success

✓ Flashing Red five times (0.3s gap): Start-up failure

(2) Run Process

✓ Flashing Fast Green (1s gap): Producing power.

✓ Flashing Slow Green (2s gap): Producing power but one input is abnormal.

✓ Flashing Slow Green (4s gap): Producing power but there is no communication with DTU.

✓ Flashing Red (1s gap): Not producing power AC grid invalid (Voltage or frequency out of range).

✓ Flashing Red (0.5s gap): There is a fault except the abnormality of grid.

(3) Other Status

✓ Flashing Red and Green alternately: Firmware is corrupted.

MI-1000T/MI-1200T/MI-1500T

*Note: All the faults are reported to the DTU, refer to the local APP of the DTU or Hoymiles Monitoring Platform for more

information.

6.3 On-site Inspection (For qualified installer only)

To troubleshoot an inoperable microinverter, follow the steps in the order shown.

1. Verify the utility voltage and frequency are within ranges shown in the in appendix Technical Data

of this microinverter.

2. Check the connection to the utility grid. Verify utility power is present at the inverter in question by

removing AC, then DC power. Never disconnect the DC wires while the microinverter is producing

power. Re-connect the DC module connectors and watch for five short LED flashes.

3. Check the AC branch circuit interconnection between all the microinverters. Verify each inverter is

energized by the utility grid as described in the previous step.

4. Make sure that any AC breaker are functioning properly and are closed.

5. Check the DC connections between the microinverter and the PV module.

6. Verify the PV module DC voltage is within the allowable range shown in appendix Technical Data

of this manual.

7. If the problem persists, please call Hoymiles customer support.

Warning

➢ Do not try to repair the microinverter. If the troubleshooting fails, please return it to the factory for replacement.

6.4 Routine Maintenance

1. Only authorized personnel are allowed to carry out the maintenance operations and are responsible

to report any anomalies.

2. Always use the personal protective equipment provided by the employer when carry out the

maintenance operation.

3. During normal operation, check that the environmental and logistic conditions are correct. Make sure

that the conditions have not changed over time and that the equipment is not exposed to adverse

weather conditions and has not been covered with foreign bodies.

4. DO NOT use the equipment if any problems are found, and restore the normal conditions after the

fault removed.

MI-1000T/MI-1200T/MI-1500T

5. Conduct an annual inspection on various components, and clean the equipment with a vacuum

cleaner or special brushes.

Do not attempt to dismantle the Microinverter or make any internal repairs! In order to preserving the

integrity of safety and insulation, the Microinverters are not designed to allow internal repairs!

The AC output wiring harness (AC drop cable on the Microinverter) cannot be replaced. If the cord is

damaged the equipment should be scrapped.

Maintenance operations must be carried out with the equipment disconnected from the grid (power

switch open) and the photovoltaic modules obscured or isolated, unless otherwise indicated.

For cleaning, do not use rags made of filamentary material or corrosive products that may corrode

parts of the equipment or generate electrostatic charges.

Avoid temporary repairs. All repairs should be carried out using only genuine spare parts.

If all the microinverters connect to the DTU-Pro, the DTU can limit the output power imbalance of all

the microinverters between phases to below 3.68kW if required. Please refer to “Hoymiles Technical

Note Limit Phase Balance” for more details.

Each branch should provide a circuit breaker, but no need for central protection unit.

6.5 Replace Microinverter

a. How to remove the Microinverter.

➢ De-energize the AC branch circuit breaker.

➢ Remove the PV panel from the racking, and cover the panel.

➢ Using a meter to measure and make sure there is no current flowing in the DC wires between

panel and microinverter.

➢ Use the DC disconnect tool to remove the DC connectors.

➢ Use the AC disconnect tool to remove the AC connectors.

➢ Un-screw the fixing screw on the top of the microinverter and remove the microinverter from the

PV racking.

b. How to replace the Microinverter:

➢ Please record down the new Microinverter’s SN.

➢ Please make sure the AC branch circuit breaker if off, and following the Microinverter installation

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Hoymiles HM-1000N User manual

Hoymiles HM-1000N User manual

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